Scene of deadly shooting in rural Longview in September 2015 (KPTV file image)

Scene of deadly shooting in rural Longview in September 2015 (KPTV file image)

LONGVIEW, WA (KPTV) -

A 74-year-old Longview man has been convicted of first-degree aggravated murder for killing his estranged wife in September 2015.

A jury delivered a guilty verdict against Cleon Orville Moen in court Thursday.

The body of 57-year-old Michelle Moen was discovered at a home on the 200 block of Robertson Road in rural Longview on Sept. 6, 2015.

She died of blunt force head trauma and strangulation, according to the Cowlitz County Coroner's Office, and the manner of death was ruled a homicide.

A family friend first called 911 to report that he was invited to the home for dinner, but when he arrived he discovered that Cleon Moen had killed Michelle Moen.

Deputies said Cleon Moen then attached an exhaust pipe from his truck to an outbuilding in an attempt to kill himself.

He was not complying with first responders at the scene and a K-9 bit him, leading to his arrest.

Cleon Moen was taken to a hospital for treatment of carbon monoxide poisoning. He remained under guard by deputies until he was released from the hospital and booked into jail.

Less than a year before the murder, Cleon Moen shot himself with a 12-gauge shotgun he removed from his truck outside the Cowlitz County Hall of Justice. He had just left court following a hung jury on misdemeanor assault-domestic violence charges against him.

A note from Cleon Moen was discovered at the time outlining marital problems and his intention to shoot himself.